// Copyright (c) 2009, Philip Tucker
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the <organization> nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY Philip Tucker 'AS IS' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL Philip Tucker BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package edu.luc.android;


public class Strings {
  /**
   * @param s String to check.
   * @return True if null or empty string.
   */
  public static boolean isEmptyOrNull(String s) {
    return s == null || s.length() == 0;
  }
  
  /**
   * @param s String to check.
   * @return Empty string if null; otherwise string with leading and trailing 
   * whitespace trimmed.
   */
  public static String safeTrim(String s) {
    return s == null ? "" : s.trim();
  }
  
  /**
   * @param items Items to join.
   * @return Items joined separated by commas.
   */
  public static String join(Object... items) {
    return join( ',', items);
  }

  /**
   * @param delim Delimiter.
   * @param items Items to join.
   * @return Items joined separated by delim.
   */
  public static String join(char delim, Object... items) {
    StringBuilder result = new StringBuilder();
    boolean isFirst = true;
    for (Object item : items) {
      if (!isFirst) {
        result.append(',');
      } else {
        isFirst = false;
      }
      result.append(item.toString());
    }
    return result.toString();
  }
}
